Improvement in pumps



UNITED STATES PATENT OEEICE.

NATHAN STEDMAN, OF AURORA, INDIANA.

IMPROVEMENT IN PUMPS.

Specification forming part of Letters Patent No. 39,84 2, dated September 8, 1863.

` Improved Double-Acting Submerged Pump;

and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing, ina-king a part of this specification, said drawing being a vertical central section of my invention.

This invention consists in the employment or use of a hollow piston provided with a valve of novel construction, and a tubular piston-rod, in connection with waterpassages and a double valve placed iu-relation with the pump-cylinder, and all arranged to operate as and for the purpose set forth.

To enable those skilled in the art to fully understand and construct my invention, I will proceed to describe it.

A represents the puinpcylinder, which is provided with a hollow piston, B, having a tubular rod, O.

D is a watervpassage at one side of the cylinder A, and which communicates with the cylinder at its upper end, as shown at a, thel lower end of the passage D communicating at b with a horizontal passage, E, underneath the pumpcylinder A.

F is a suction-passage, which is between the pump-cylinder A and the passage E. The other end of the suctionpassage F is open.

G is a double puppetvalve, the stem c of which passes vertically through the passage F, and has two circular plates, d d', attached to it, one at each end. One of these plates, d, works over anV opening, e, in the bottom ot' the pump-cylinder A, and the other plate, d', works over an opening, c', in the upper part' of the passage E, as plainly shown in the drawing.

Within the hollow piston B there is placed a valve, H, which is hollow, and is provided with an internal vertical tube, f, closed at its top and open at its lower endto receive a vertical rod, I, which is attached at its lower end to a cross-bar, g, which extends across the lower valve-opening, h, in the bottom of the piston. In the top of the piston there is made an opening, li', which is directly over and in line with the opening h in the bottom of the piston.

The operation is as follows: When ,the piston B rises, a suction is of course produced in the lower part of the cylinder A under- .ncath the piston,and the valve G rises, the

plate d leaving the opening c in the bottom of the cylinder A open, andthe plate d closing the opening e in the upper part of the passage E. The water therefore passes into the passage F up through the opening c into the cylinder A, following the piston. As the piston B rises and the cylinder fills below it, the

water in the upper part of the cylinder above the piston is forced through the opening h into the'piston and up through the tubular rod O and out of the upper end of the latter. (See red arrows.) When the piston descends, the opening h in the top of the piston is closed by the valve H, and the opening h in the bottom of the piston is opened. The

plate d ot' the valve G .closes over the opeuing e in the bottom of the cylinder A, and the plate d is below the opening e' in the upper part of the passage E. A suction, therefore, will be produced in the upper part of the cylinder A, and the water will pass through the passage E up through the passage D and into the. upper part of the cylinder A, while the water, which at the previous upward movement of the piston was drawn into the pump cylinder, is forced up through the piston B and tubular rod C. Thus it will be seen that a doubleacting submerged pump is obtained of exceedingly simple and economical construction. l

The tube f within the valve H serves as a guide for the valve, the rod I servingas a valve-stem.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

The hollow piston B, provided with the hollow valve H and tubular rod C, in combination with the water-passages D E F and double puppet-valve G, all arranged to operate as and for the purpose herein set forth.

NATHAN STEDMAN. Witnesses W. G. CADWELL, J. W. BAILEY. 

